Joining and cornering strips



June 26, w P T RSEN JOINING AND CORNERING STRIP Filed April 12, 1943 2Sheets-Sheet 1 9 INVENTOR. MV/l'am H. P: f'erseh June 1945- w. H.PETERSEN Q 2,379,179

JOINING AND CORNERING STRIP Filed April 12, 1943 2 Sheets-Sheet 2 M/I/I(am 17, PcTErs en UM! ;& m-vg Patented June 26, 1945 2,379,179 JOININGAND CORNERING STRIPS William H. Petersen, Chicago, Ill., assignor toSheetlock Company, Chicago, 111., afirm consisting of himself, WilliamG. Knox, and Forrest R.

Grooms, copartners Application April 12, 1943, Serial No. 482,814 16Claims. (Cl. 20-92) This invention relates to joining and comerlngstrips.

It is highly desirable to provide a strip having means associatedtherewith whereby the strip may readily and conveniently join and/orwhich will be more particularly described hereinafter. As. shownespecially in Fig. 3 the rounded bottom of each receiving channel 5 and6 makes a tight joint with the edge of the board without the use ofcement or putty.

In the modification shown in Fig. 4 the central corner rigid or flexibleboards without the neces- 5 axially extending shank 2a of a strip lacorresity of drilling any holes or making any special .sponding to 2 ofthe first embodiment is bent preparation of the boards and without thenecesalong its longitudinal center line at a ninety dey of any tools,screws, nails, bolts or other gree angle (or other angle according torequirelaccessolles being ed- 10 ments) so as to corner as well as jointhe boards The Prima y object of this invention is ac- (here designated1a and 8a). The otherparts cordingly to provide such a strip. of thestrip la are similar to the corresponding Other and further objects ofthis invention parts of strip I. It will be noted that the shank willbecome more apparent hereinafter from an la presents a smooth innersurface making it examination of the specification .and claims in idealfor use in joining the seams of ducts since junction with theaccompanying drawings no interference to fluid flow results. wherein: Inthe modification shown in Fig. 5 a smooth Fig. 1 is a perspective viewof a joining strip outside corner surface is provided as well as theembodying this invention; smooth inside comer surface by adding to theFig. 2 is an upside down perspective view of features of the form shownin Figs. 4 and 6, an the a trip in use and joining two boards; angularsnap fastening strip 9 which has return Fig. 3 is a cross-sectional viewshowing the bent edges III which fasten over the correspondmanner inwhich the notch grips and holds the ing edges of the strip la at theouter edges of boards together; the receiving channels.

Fig. 4 is a perspective view of a cornering and In the modificationshown in Fig. 'l the join- Joining strip embodying this invention; ingstrip, here designated l I, is made of plastic Fig. 5 is a perspectiveview of a modified form and has opposed receiving ch nne 12 and I3, ofstrip similar to that of Fig. 4; for the boards, formed in its oppositeedges. The Fig. 6 is a view similar to that of Fig 4 ho walls of theplastic strip II at longitudinally ing the strip inuse; spaced positionsin the channels I! and I3 arev Fig. 7 is a perspective view of modifiedform recessed as at It to readily receive and retain of joining strip;U-shaped spring clips II. These clips ii are, Fig. 8 is an enlarged endand detailed view of preferably of spring cold-rolled steel and each oneof the clips forming a portion f th strip is provided with inwardlystruck integral fastenof Fig. 7; ing and locking tangs for automaticallyfasten- Flg. 9 is a sectional view taken at the line 9-9. ing andretaining the board edges in the receivof. Fig. 8; and ing channels I!and I! when said edges are in- Fig. 10 is a sectional view taken at, theline serted thereinl0--l0 of Fig. 9. The details of the form, shape andfunction of Referring to the drawings more particularly, 40 theseinwardly struck fastening a locking in Figs. 1, 2 and 3 ther is shown asheet metal gs are the same in all modifications so th strip l, in t i mt of cold roued steel, for their description for the last modificationshould joining ends of ducts, seams of casings or ducts sumcek or forany continuous flat work. e p h. hi h cuts the 131185 A and B The stripI is preferably cold-rolled sheet makes including a C Parallel withsteel and has a central axially vextending'smmk g the longitudinalaxisof the joining (or comerwith its opposed marginal portions 3 and 4bent i118) rip and the ed of the boards to to form opposed receivingchannels 5 and 6, rejoined, and which p h simultaneously forms t forboards 1 and a to be joined said tangs in the shape of spaced similarsharp When the edges of the boards 1 and 8 are inp ints with spring-likesloping surfaces D and serted in their respective receiving channels 5 Eea up to each Point from the direction in and 8, they are automaticallyfastened and rewhich the boards are inserted into the chanels tainedtherein by virtue of inwardly struck inand presenting comparativelynon-yielding tegral fastening and loci-ring tangs A and B, shoulders Fand G against withdrawal of the 6 boards. Th edges of shoulders F and Gextend a the channel and away from approximately to a plane which isparallel to the axis of the channel.

The use and advantages of the afpredescribed strips will be apparentwithout further detail.

I am aware that many changes may be made without departing from theprinciples of my invention and I therefore, do not wish to be limited tothe details shown and described.

I claim:

1. A stripfor adjoining adjacent edges or sheetlike material comprisinga central shank having opposed longitudinally extending receivingchannels for receiving said adjacent edges, said strip being providedwith spaced sheet metal portions in said channels, each said portionhaving a pair of adjacent inwardly struck right angular pointed tangsformed by a T-cut and presenting edges sloping into the channel and awayfrom the entrance thereto and also presenting edges provid ing.efiective shoulders both of which extend approximately to a planeparallel to the axis of the strip. and channel whereby said tangs willpermit movement of said material into the channels and will lock thematerial therein.

2. A strip for joining adjacent edges of sheetlike material comprisingacentral shank having opposed longitudinally extending receiving channelsfor receiving said adjacent edges, said strip being provided with spacedsheet metal portions in said channels, each said portion havinganinwardly struck angular pointed tang formed from a right angular cut,one edge of said portion, at

said cut, being parallel to the axis of the chani nel, whereby the tangpresents one edge forming an eflective shoulder against removal of thematerial from the channel and one edge sloping into the entrance theretoto permit entrance of the material thereinto.

3. A sheet metal strip for joining adjacent edges of sheet-like materialcomprising a central flat shank and marginal portions on either side ofthe shank folded double to form opposed longitudinally extendingreceiving channels for receiving said adjacent edges, said strip havinginwardly struck angular pointed tangs in said channels, each formed froma right angular cut, one edge of said strip, at said cut, being parallelto the axis of the channel whereby the tang presents one edge forming aneffective shoulder against removal of the material from the channel andone edge sloping into the channel and away from the entrance thereto topermit entrance of the material thereinto.

4. A plastic strip for joining adjacent edges of sheet-like materialcomprising a central shank having opposed longitudinally extendingreceiving channels for receiving said adjacent edges, said strip beingprovided with spaced sheet metal portions in said channels, each saidportion having an inwardly struck angular pointed tang presenting oneedge sloping into the channel and away from the entrance thereto andalso presenting an edge in a plane approximately parallel to the axis ofthe'stripand channel whereby said tang will permit movement of thematerial into the channel and then lock the material therein.

5. A strip for joining and comerlng adjacent edges of sheet-likematerial comprising a central shank bent angularly along its axis andprovided with angularly disposed longitudinally extending receivingchannels for receiving said adjacent edges, said strip being providedwith spaced sheetmetal portions in said channels, each said portionhaving an inwardly struck angular pointed tang formed from a rightangular cut, one edge removal of the material from the channel and thechannel and away from to permit entrance of the one edge sloping intothe entrance thereto material thereinto.

6. A strip for joining and cornering adjacent edges of sheet-likematerial comprising a central sheet metal shank and marginal. portionson either side of the shank folded double to form longitudinallyextending receiving channels for receiving said edges, the shank bentlongitudinally along its axis whereby said channels are disposed inplanes at an angle to each other, said strip having inwardly struckangular pointed tangs in said channels, each formed from a right angularcut, one edge of said strip, at said cut, being parallel to the axis ofthe channel whereby the tang presents one edge forming an effectiveshoulder against removal of the material from the channel and one edgesloping into the channel and away from the entrance thereto to permitentrance of the material thereinto.

'1. A sheet metal strip for joining and cornering adjacent edges ofsheet-like material comprising a central shank and marginal portions oneither side of the shank folded double to form longitudinally extendingreceiving channels for and provided with inwardly bent marginal portionsfor engagingthe outer edges of said channels.

8. A plastic strip for joining adjacent edges of sheet-like materialcomprising a central shank having opposed longitudinally extendingreceiving channels for receiving said adjacent edges, said strip beingprovided with spaced spring clips adapted to be inserted in retainingrecesses in said channels, each clip having an inwardly struck angularpointed tang presenting one edge sloping into the channel and away fromthe entrance thereto and also presenting an edge in a planeapproximately parallel to the axis of the strip and'channel whereby saidtang will permit movement of the material into the channel and then lockthe material therein.

9. A plastic strip for joining adjacent edges of sheet-like materialcomprising a central shank having opposed longitudinally extendingreceiving channels for receiving said adjacent edges, said strip beingprovided with spaced spring clips adapted to be inserted in retainingrecesses in said channels, each clip having means for permitting inwardmovement of the material into the channel and then locking the materialtherein.

10. A sheet metal device for joining adjacent edges of sheet-likematerial, comprising a folded portion forming a receiving channel, saidportion having a pair of adjacent inwardly struck angular pointed tangsformed by a T-cut and presenting adjacent edges sloping into the channeland away from the entrance thereto and also presenting edges extendingapproximately to a plane parallel to the axis 011 the channel wherebysaid tangs will permit movement of said material into the channel andwill lock' the material therein.

WILLIAM H. PETERSEN.

